<!--  -->
<template>
 <div>
     <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb> 

    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示警告框 -->
        <el-alert
            title="注意：只允许为第三级分类设置相关参数！"
            type="warning"
            :closable="false"
            show-icon>
        </el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                    v-model="selectCateKeys"
                    :options="cateList"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
            </el-col>
        </el-row>

        <!-- Tabs标签页 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <!-- 其他列 label列的名称 prop真实展现出的数据-->
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <!-- 其他列 label列的名称 prop真实展现出的数据-->
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>


    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
        :title="'添加'+ titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close='addFormClosed'>
        <!-- 表单区 用于提交交数据 -->
        <el-form :model="addForm" ref="addFormRef" :rules="addFormRules" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <!-- 尾部按钮区 -->
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
        :title="'修改'+ titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close='editFormClosed'>
        <!-- 表单区 用于提交交数据 -->
        <el-form :model="editForm" ref="editFormRef" :rules="editFormRules" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <!-- 尾部按钮区 -->
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
 </div>
</template>

<script>
export default {
    data() {
        return {
            //商品分类列表
            cateList:[],
            // 配置级联选择框的
            cateProps:{ expandTrigger: 'hover' ,
            value:'cat_id',
            label:'cat_name',
            children:'children'},
            // 级联选择框双向绑定到的数组
            selectCateKeys:[],

            //被激活的页签的名称
            activeName:'many',

            // 用于动态参数，静态属性不同表格的数据
            onlyTableData:[],
            manyTableData:[],
            
            // 控制添加动态/静态对话狂的显示与隐藏
            addDialogVisible:false,
            addForm:{
                attr_name:''
            },
            addFormRules:{
                attr_name:[
                     { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },

            editDialogVisible:false,
            editForm:{
                
            },
            editFormRules:{
                attr_name:[
                     { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            
            
        }
    },
    created(){
        // 获取商品分类列表数据
        this.getCateList()
    },
    methods:{
        // 获取商品分类列表数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !=200)
                return this.$message.error("获取商品列表失败");
            this.$message.success('获取商品列表成功')
            this.cateList = res.data 
        },
        // 级联选择器选择项发生改变时触发的事件
        handleChange(){
            // 此时获取的是动态参数的参数列表数据
            this.getParams()
        },

        // tabs标签的点击事件
        handleTabClick(){
            //此时，根据是哪个tabs标签来判断是要获取动态参数还是静态列表
            this.getParams()
        },
        //获取动态参数，静态属性的参数列表
        async getParams(){
            if(this.selectCateKeys.length !== 3){
                this.selectCateKeys = []
                this.manyTableData = []
                this.onlyTableData=[]
                return 
            }
            // 根据所选分类的id，和对应的面板（many，only）来将数据提取出来
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}}) 
            if(res.meta.status!==200){
                return this.$message.error("获取参数列表失败");
            }
            
            res.data.forEach(item =>{
                item.attr_vals= item.attr_vals? item.attr_vals.split(' '):[]
                //控制文本框的显示与隐藏
                item.inputVisible = false
                item.inputValue = ''
            })
            console.log(res.data)
            // 这个res.data是动态的还是静态的，分别进行不同的存储，用到不同的表格里面
            if(this.activeName == 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        // 添加对话框的关闭事件，重置
        addFormClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 添加参数对话框提交数据
        addParams(){
            this.$refs.addFormRef.validate(async (valid)=>{
                if(!valid) return 
                const{data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,
                {attr_name:this.addForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status!==201){
                return this.$message.error("添加参数失败");
                }
                this.addDialogVisible = false
                this.getParams()

            })
        },

        // 点击按钮，显示修改对话框
        async showEditDialog(attr_id){
            const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error("获取参数失败");
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        editFormClosed(){
            this.$refs.editFormRef.resetFields()
        },
        async editParams(){
            this.$refs.editFormRef.validate(async (valid)=>{
                if(!valid) return 
                const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status!==200){
                return this.$message.error("修改参数失败");
                }
                this.editDialogVisible = false
                this.getParams()

            })
        },

        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err=>err)
            if(confirmResult !== 'confirm'){
                return 
            }
            const{data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status!==200){
                return this.$message.error("删除参数失败");
            }
            this.getParams()

        },
        // 文本框失去焦点或按下了enter建都会被触发
        async handleInputConfirm(row){
            // trim方法用于去除字符串两边的空格
            if(row.inputValue.trim().length === 0){
                row.inputValue=''
                row.inputVisible=false
                return 
            }
            // 输入合法的操作
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            //持久化保存到数据库中
            const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                {attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')})
                if(res.meta.status!==200){
                return this.$message.error("修改参数失败");
                }       
        },
        showInput(row){
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick 方法的作用：当页面上元素被重新渲染之后，才会执行指定回调函数中的代码
            this.$nextTick( () => {
                this.$refs.saveTagInput.$refs.input.focus();
                });
        },
        async handleClose(i,row){
            row.attr_vals.splice(i,1)
            const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                {attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')})
                if(res.meta.status!==200){
                return this.$message.error("修改参数失败");
                }    
        }

    },
    computed:{
        // 如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            if(this.selectCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 被选中的三级分类的id
        cateId(){
            if(this.selectCateKeys.length === 3){
                return this.selectCateKeys[2]
            }
            return null
        },
        // dialog对话框是添加动态参数/静态属性
        titleText(){
            if(this.activeName == 'many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    }
}
</script>

<style  lang='less' scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 150px;
}
</style>